Improvement in saw-grinding machine



UNITED STATES PATENT QFFIGE.

(l EORGE \VALKEB, ()F MIDDLETOVN, NEV YORK;

IMPROVEMENT lN SAW-GRINDING MACHINE.

S ecification forming part of Letters Patent No. 100,089, dated February 22, 1870.

To all whom it may concern:

Be it known that I, GEORGE TALKER, of Middletown, in the county of Orange and State of New York, have invented a new and Improved Saw-Grinding Machine; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to improvements in machines for grinding long saws; and it consists in an improved arrangement of apparatus for holding the saws, while grinding, from springing under the action of the stone and the pusher or feeder.

It also consists in an improved arrangement of the presser for adjusting the plates to grind thinner toward the back; and it also consists in an improved automatic belt-shifting apparatus.

Figure l is plan View of my improved machine. Fig. 2 is a longitudinal section of the same; and Fig. 3 is a side View.

Similar letters of reference indicate corresponding parts.

A is the main frame; 13, the grindstone, and O the adjustable frame for holding the saw and the saw-operating carriage or pusher. This frame is pivoted at one end on the posts D, and arranged for adjustment higher or lower thereon, as may be required. The other end is supported above the axis of the stone by the adjusting-screws E, and slides up and down on the ways or posts F for adjustment to the stone as it wears away.

G is the saw holder or pusher, consisting of a bar, D traversing the frame 0, and having projections D and connected to the sliding toothed bars H, working on the guides or ways I, and operated by the toothed wheels K on the driving-shaft L. These projections 1) work between thin bars D arranged in pairs one above the other, and attached to the frame 0 so as to extend from the presser M to the rear end of the said frame. They rest on the transverse bar N, near the presser, and receive thereat the saw-plates 0 between them, the said plates being forced between them and against the projections D of the bar D by the action of the stone, the top of which moves in that direction.

The upper bars, D take under the projections F of the presser, and are thereby gently pressed down to confine the said plates between them and the lower ones, while they are moved to and fro by the stone in one direction and the bar D in the other, and prevent them from springing up or down under the action of the stone, which is very forcible when the presser M is screwed down hard.

For varying the action of the presser M to grind the plates tapering from front to back, it is arranged in the slides Q, which work up and down on the posts F, to slide at the ends in vertically-in clined grooves toward each end of the machine, so as to traverse the face of the stone obliquely, and to rise away from it when moved in one direction and fall toward it and forth in these grooves I have provided the wedges B, one on each side at each end, and the hand-lever, to which they are connected, as shown, for operating them, whereby either end may be moved forward or backward, to be depressed or raised as required, for beveling the saw-plates when either side up.

On the side opposite the bars 1) and pushbar D the plates rest, when projecting suftioiently from the stone and presser to require support, on the adjustable plate U, which may be moved to or from the stone, as may be re quired for plates of difierent thicknesses or lengths.

For reversing the motion of the shaft L to move the saws back and forth, I have arranged on the said shaft two loose pulleys, W W, connected by rods X, projecting from the side of one, and having bent ends, taking behind a ring or plate on the other, so that each may revolve independently of the other, but both will slide on the shaft alike and in unison. Between these pulleys is a pin, y, projectin g from each side of the shaft, and each pulley is provided on the side fronting the other with one or more short pins, Z, which,

will engage it and turn the shaft.

These pulleys are caused to run in opposite directions by a belt for each, suitably arwhen moved in the other and to move it back when the pulley is moved toward the pin 1,.

ranged, and they are caused to slide on the shaft for alternately engaging with the pin y by the crotched bell-crank 1 pivoted at M, and connected at 3 with the slide arranged parallel with the toothed bars H, to be acted on by the lugs H thereon, which may be attached adjustably for changing the motion for short or long saws.

The end of the belt-shifter y is provided at the end 1 with a tilting weighted lever, Z, to insure the full movement and to hold it in either position.

This arrangement of shifting apparatus has the advantage of accomplishing the shifting operation much more quickly after the lugs have struck the slide and with less movement of the slide than can be done where the belt is shifted from one pulley to another, for the pulleys are only required to move on the shaft sufficiently to engage the pins Z of one pulley and disengage those of the other with the pin 3 of the shaft.

Having thus described my invention, I claim as new and desire to secure by Letters Patcut- 1. The combination, with the stone-presser and push-bar D of the plates D arranged for operation substantially as specified.

2. The arrangement of the presser M, with the slides Q, for adjustment of the ends forward or back and to or from the face of the stone, substantially as specified.

3. The combination, with the presser and slides Q, of the wedges R and hand-levers I, substantially as specified.

4. The belt-shifting apparatus constructed and arranged for operation substantially as specified.

The above specification of my invention signed by me this 13th day of November, 1869.

GEO. \VALKER.

Witnesses:

Gno. W. 1\.[ABEE, ALEX. F. Ronnn'rs. 

